Add type assertion in deepcopy_internal for Arrays (JuliaLang#40909)

Add type assertion in deepcopy_internal for Arrays
Liozou · May 25, 2021 · ff85419 · ff85419
1 parent 6f71de4
commit ff85419
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Showing 2 changed files with 6 additions and 2 deletions.
diff --git a/base/deepcopy.jl b/base/deepcopy.jl
@@ -87,7 +87,7 @@ end
 
 function deepcopy_internal(x::Array, stackdict::IdDict)
  if haskey(stackdict, x)
- return stackdict[x]
+ return stackdict[x]::typeof(x)
  end
  _deepcopy_array_t(x, eltype(x), stackdict)
 end

diff --git a/test/copy.jl b/test/copy.jl
@@ -233,4 +233,8 @@ end
  @test copyto!(s, view(Int[],Int[])) == [1, 2]
  @test copyto!(s, Float64[]) == [1, 2]
  @test copyto!(s, String[]) == [1, 2] # No error
-end
+end
+
+@testset "deepcopy_internal arrays" begin
+ @test (@inferred Base.deepcopy_internal(zeros(), IdDict())) == zeros()
+end